manga help

Hello

can any one help me? I'm looking for this manga i start reading a long time ago, i only read the first chapter tho, and what i remember from it is that

It was a story about a kid*probably mid school* thats bad at everything in school to sports and games. He help or work at a place were they play pool, and hes really and i mean really good at it, and one after school his classmate came along and start playing were his working and this old man came along and ask to play with them and he pretend he didn't know how to play so basically hes a con artist and one of the student is his partner.